Diesel engines why not more available in smaller vehicles ?

ppine wrote:

wilber1 wrote:

Bedlam wrote:
DEF after treatment is supposed to knock down the NOx emissions.

And yet when any of them run afoul of emission regs its because of NOX.

The only real difference between US and European regs is allowed NOX emissions.

I used to be in the air quality business. The Europeans have few if any air quality restrictions on vehicles. In the US, the EPA monitors, CO, CO2, HC, NOx, SOx, and several others like evaporation loss.